Fix typo (reported by Tonnes).
[Bug 799411] Fix pluralization of "1 replies" with ngettext.
[bug 839417] Replace custom js with input type="number" pattern="\d*".
Minor cleanup of poxx.py

* nix the "if the string isn't long enough, add an apostrophe!" section
  because that's not needed anymore
* add some more color
Cosmetic: Fix formatting
[Bug 797399] Fix wiki.models.Document.from_url()